Polishing machine for bearing races



@cft. 31, 1950 T. R. BRINK 2,527,791

POLISHING MACHINE FOR BEARING RACES 7 Filed Dec. 28, 1946 5 Sheets-Sheet l I77 V15 2'? 2 5/" T 11755 DID/E REF/77k @ch 33, E950 T. R. BRHNK 295279791 POLISHING MACHINE FOR BEARING RACES Filed Dec. 28, 1946 5 Sheets-Sheet 2 IHVEWZUH @cfi. 31, 1950 r. R. BRINK 4 2,527,79l

POLISHING MACHINE FOR BEARING RACES Filed Dec. 28, 1946 5 Sheets-Sheet 3 :FIg 5 ch31 195@ T. R. BRINK 2,527,791

POLISHING MACHINE FOR BEARING RACES Filed Dec. 28, 1946 5 Sheets-Sheet 4 q I I 142; Z8 M Oct. 33, 195G T. R. BRINK POLISHING MACHINE FOR BEARING RACES Filed Dec.

5 Sheets-Sheet 5 Patented Oct. 31, 195

2,527,791 I POLISHiN'G MACHINE FOR BEARING RACES Theodore R. Brink, Michigan City, Ind., assignoi to International Harvester Company, a corporation of New Jersey Application December 28, 1946, Serial No. 718,916

6 Claims.

This invention relates to a new and improved polishing machine for ball bearing races and has for one of its principal objects the provision of means for relatively completely removing ridges from ball bearing races caused by grinding.

An important object of this invention is to provide a. polishing machine having a plurality of rotatable polishing wheels adapted to successively and automatically operate on ball bearing races as they are fed into the machine.

Another important object of this invention is a the provision of a plurality of polishing wheels placed at different angles and adapted to successively polish a bearing race.

ing polishing wheel spindles adapted to automatically and simultaneously move the polishing wheels into a position within an outer bearing 'race and thereupon against the bearing surface within the race, all in combination with a turnraces and to move the races successively from one work head to another.

Still another object of this invention is. to provide afiuid pressure means for effecting movemerit of a-polishing wheel into position against" the internal annular bearing surface of an outer 'ball bearing race, and further to vary the amount of pressure at which the polishing wheel contacts th bearing surface to be polished.

Other and further important objects of this invention will become apparent from the disclosures in the following specification and accompanying drawings, in which:

Figure 1 is a top plan view of the bearing race polishing machine of this invention.

Figure 2 is a partial side elevational view taken on the line 2-2 of Figure 1.

Figure 3 is a sectional view taken on the line 33 of Figure 2.

Figure 4 is a vertical sectional view taken on the line 4-4 of Figur 1 and with parts thereof in elevation.

Figure 5 is a view partially in section taken substantially on the line 5-5 of Figure 1 and table adapted to carry a plurality of the bearing 2 showing one of the individual work heads employed in this device.

Figure 6 is a front elevational view of one of the work heads in tilted position.

Figure 7 is a front sectional detail of the first of a series of polishing wheels shown in engagement with the race to be polished.

Figure 8 is a side sectional detail of the polishing wheel engaging the internal ball bearing race as shown in Figure 7. a

Figure 9 is a front sectional detail of the second in the series of polishing wheels shown in working engagement with the bearing race.

Figure 10 is a side sectional detail of the device as shown in Figure 9.

Figure 11 is a front sectional detail of the third in th series of polishing wheels employed on this device and showing the polishing wheel operatively engaging the bearing race to be polished.

Figure 12 is a side sectional detail of the device as shown in Figure 11. I

As shown in the drawings:

The reference numeral It] indicates generally a supporting structure. A turntable. l l is mounted for rotation within the supporting structure In and is substantially flush with a table top platform l2 of the supporting structure. The turntable is equipped with mechanism (not shown) to effect rotation thereof. A plurality of work holders is provided in an annular path around the surface of the turntable at regular.

intervals. The work holders shown at [3 are best illustrated in Figures 1 and 2. Each holder, consisting of three jaws l4 arranged in a circular fashion, is adapted to receive a bearing race member I 5. The bearing race is of the type adapted to be positioned on the outside of a bearing and is commonly called an outer bearing race. The outer bearing race has an internal annular bearing path IS.

The machine set forth in this application is for the purpose of polishing the internal annular surfaces of outer bearing races. There are six work holders l3 placed around the turntable ll. Each of these work holders occupies a particular station on the table designated by the letters A, B, C, D, E, and F. The A station is the position where the bearing races to be polished are inserted into the machine. One of the three jaws M of the holders I3 is moved radially outwardly in both of the stations A and F. In all the other stations B, C', D, and E, the slidable jaw is in an inward position firmly clamping the race held therein. As previously stated, an outer bearing race I5 is placed in the holder It at the station A when the jaws are in a non-clamping position. The turntable H is arranged to automatically index or move one-sixth of a revolution at regular time intervals. These intervals, of course, can be controlled so that the amount of polishing required will be accomplished. As the turntable l l rotates, the outer bearing race l in the holder [3 moves from the station A to the station B, and during this movement the sliding jaw comes inwardly to grip and firmly hold the bearing race 15. Each of the holders I3 is rotated by means (not shown) beneath the turntable II.

The table indexing means andthe means for rotating the work holders are not new and hence have not been shown in the drawings. These means can take the form of those shown in the Belcourt Patent 2,386,649. Sheet 5, Figure 6 of the Belcourt drawings shows the table indexing means and the work holding rotating means, and page 4, column 2, lines 13 to 28 of the Belcour-t specification describes the indexing and rotating means.

Work or polishing heads are shown mounted on the supporting structure table top 12 at G, H, I, and J corresponding-;to the stations B, C, D, and E on the turntable -l l. Each of the work heads is equipped with apolishing wheel which the work head positions in a plane within the internal race to be polished, and thereupon the polishing wheel is moved against the race and both the polishin wheel and the race are rotated, with the result that the races are efficiently polished.

As the turntable H is indexed, the race is passes beneath and is polished by each of the work heads G, H, I, and J. At the station 3 the work head G 'is tilted about the axis IN on the pin I which is. afiixed in the plate 128 of the work head. The structural member 38 is fixedly attached to the table :top 12 and'the plate I26 on which the work head elements are attached is swingable about the pin H5. The pin I25 has a threaded stud 127 projecting through a boss I28 on the -stationary support '38. A nut H9 is adapted to 'be drawn :up on the threaded stud to hold the plates I28 and 38 together. Cap screws [30 and l 3| threadedly engage the tiltable plate I26 and when they are loosened along with the nut E29 the plate |2G may be turned about the pin 'l25 with the cap screws I36 and I3! moving through enlarged slots in and Q33 respectively in the stationary support 38. These slots are shown in Figures 4, 5, and 6. A spindle l1 having a polishingwheel l8 at the bottom thereof is carried by the tiltable plate I26. This inclination of the work head and spindle I! is best shown in Figures 2, 6, 7, and 8; The polishing wheels are basically rubber impregnated with abrasive ma terials to effect a polishing of the bearing races. When the races are inserted in this polishing machine they have just had the annular bearing surface or race ground therein. The grinding is accomplished by a stone, and upon close examination the race will disclose numerous ridges and valleys which must be removed in order to annular internal race and about the axis 12 is adapted to polish and remove portions of the grindin ridges in the bearing race. It is important that the polishing wheel be tilted about the axis I24 as that is the center line of the race and tilting on that line insures uniform polish- 5 ing of the bearing race regardless of the angle of inclination of the polishing wheel. As the race 15 is moved beneath the work head H, it is actedupon by another polishing wheel I!) mounted on a spindle 28 and inclined with the lo. work head in a direction opposite the polishing wheel 18 shown in Figures '7 and 8. As shown in Figures 9 and 10, this polishing wheel [9 substantially cross polishes with respect to the first wheel 18. The bearing race l5 then moves is beneath the work head I and is acted upon by a polishing wheel 23 mounted on a spindle 22. As shown in Figures 11 and 12, this polishing wheel 2! is positioned straight or in the same plane as a plane drawn through the internal 2o annular race of the bearing. In other words, this polishing wheel 2lis adapted to polish parallel with the annular race and removes ridges or rough surfaoesleft by the cross polish: ings of thewheels l8 and l9. The'wheel .2lfi's g5 initially positioned centrallyof the outer bearing race, and for polishing operation it is moved laterally to a position shown by the wheels ill and IS in Figures 11 and :12. p

The work heads G, H, I, and J areall similar 30 to one another. Another function is to move their respective polishing wheels down to a position within the bearing races and thence lat erally to engagement with-the annular races. The polishing wheel associated with the .work head J hasnot been shown but it is identical to the parallel positioned polishing wheel 2i of the work head I, the only difference being less abrasive material in the polishing wheel of the work head J. The cross polishing of the first 40 two polishing wheels l8 and I9 and the subsequent polishing by wheels positioned parallel to the races being polished results in .a highly polished surface which-contributes to long efficient bearing life. I

As shown inFigure 2, the work head G having the spindle H and polishing wheel 18 pos tioned angularly with respect to the table, is shown in operative position. The bearing race 7 t5. to be polished is held in the clamping holder it with the three substantially evenly spaced clamping members 14. The holder I3 is equipped with a downwardly, extending shaft 23, which as previously stated passes through the top surface of the turntable' llpand when :the holder is at any of the stations BpCyD, or E it-is rotated so that the clamped race, .;;l5 is also rotated. 'The" polishing wheel and-spindle 1 7 and I8, respectively, are-in alignment with the spindle 230i the workeholder 13 so that when the polishingwheel 2| "is brought downwardly it does *noticonta'ct the annular :ball bearing race as the diameter of the race is larger than-the diameter of the polishing wheel.

Thespindle 22 is driven by an electric motor or the like 24 mounted'i'at'the rear of the work head; The drive from the motor'2fl -to the spindle 22 is through the medium of belts '25, as shown in Figure 4, which extend from pulleys 2-5 'on'the motor 24 to stepped pulleys 26 on an upward continuation of the'spindlezzi .A-shieldZlcoVering the belt drive is shown in Figures 1 and 2. For purposes of illustration the shield has been removed from Figures 4 and 5. -;'I-he workv head 5 consists ofa base 28 mounted-"on the table top 1| 2 of the supporting structure Ill. The base 28, as

best shown in Figure 5, is equipped with a pair of side guide or track members 29 and 30. These track members 29 and 39 are parallel to each other and are provided on-their inner faces with an undercut or offset 3| and 32. The track members 29 and 39 are bolted or otherwise fastened to the base member 28 as shown at 33 and 34-. At the outer end of the tracks 29 and 39 and positioned substantially centrally thereof is a bracket 35 shown in Figure 2 which is fixedly attached m to the base plate 28. The bracket 35 journally carries a threaded shaft 36 having a hand wheel 3! extending from one side thereof. Rotation of the hand wheel 31 causes rotation of the threaded shaft 38, but the connection between the shaft .5

and the bracket 35 is such that no longitudinal movement of the shaft may occur. An upwardly extending structural member 38 has a base plate 39 shown in Figure 5 with outwardly extending 6 .:under pressure. A piston 54 is adapted for var :tical reciprocation in the cylinder 49. .When fluid under pressure is supplied to the inlet 5I, the piston- 54 is raised in the cylinder. The piston 54xisgequipped with apiston rod 55 extending .upwardly through the top ofgthe cylinder 49 and having an'extension 56 which extends upwardly throughxthe work head to a'position-oyerthe top 'ofthe side plates-43; A' cam Slis fastened to theupper extension 5610f the piston rod'55 and is provided with. an inclined surface 58 for engaging a-roller 59 mounted on a shaft or'pin 69 and extending between a member 6 I. As the pisto'n 54 is moved upwardly the inclined surface 58 0f the cam 51 moves upwardly and causes, the roller 59 to move to the right, as viewed in Figure 4, The roller 59thus in turn causes the member 6] to similarly move to the right. "A shaft-62 is "fastened to the'member 6i and carries a flexible flanges 49 and 4| at each side thereof which 00- cup member 63 having a washer 64 on the outside operatively engage the track members 29 and 39 with the flanges extending into the undercut or offset as shown at 3| and 32. The base plate 28 with its parallel tracks 29 and 39 mounted on the surface thereof is positioned radially with respect $2 to the center of the turntable II so that movement of the structural member 38 along and within the radially extending tracks 29 and 38 will position the work head toward or away from the center of the turntable II. member 42, shown in Figure 2, is associated with the structural member 38 and is positioned in alignment with the threaded shaft 36. The sleeve member 42 is internally threaded for the recep- 3 tion of the shaft 36. Upon rotation of the hand wheel 31 the threaded shaft 35 enters or is withdrawn from the sleeve 42. Inasmuch as the shaft 36 cannot move longitudinally the sleeve 42 and the structural member 38 are drawn toward or away from the stationary bracket 35. Movement,

of course, takes place within the track members 29 and 36. The work head may thus be accurately positioned to operate at any point in a radial line drawn from the center of the turntable.

Spaced side plates or transverse housing meme bers 43 move vertically on tilting plate I26. Each of the side plates 43 is equipped with a rearwardly extending lug at its lower end having apertures in alignment with each other.

tu'res in the lugs 44. A motor-carrying bracket 46 is hingedly attached to the pin 45, and thus the motor 24 and its supporting bracket 46 may rotatably move about the shaft 45 as an axis.

bolt 4? which extends through an aperture in the upper portion of the motor support 46 and into a back plate I 36. A spring 48 surrounds the shank of the bolt 4'! between the motor support;;.

tached by means of bolts I34 to the tilting plate 70 I26. A source of fluid under pressure (not shown) is supplied to a conduit 56 which'carries the'fluid to an inlet 5! of the cylinder 49. An outlet 52 is provided at the top of the cylinder 49 and likewise has a conduit 53 which exhausts the fluid A sleeve-like 3.

A hinge pin 013.50 rod 45 is positioned through the aligned aper- The .55 motor is limited in its rotational movement by and a washer on the inside. A nut 66 threadedly engages the shaft 62 and holds the washers and flexible cup together as a unit. A bolt 61 is adapted to fasten a front plate member 68 to the' shaft 62." It will thus be evident that as the piston 54 moves upwardly in the cylinder 49, the structure consisting of the roller 59, the rectangularly shaped member 6I., the Washer and flexible cup assembly 63, 64, and 65, the shaft 62, and the outer front plate 68 all move as a unit with respect to the stationary side plates 43. A plug member 69 is adapted to cover the chamber opening to the right of the fiexible oup 63. This plug r 'member has an annular flange I9 fastenedbs means of bolts II to a block member 12 which is fastened and carried with the side plates 43. The block I2 includesa vertical hole I3 to permit pa'ssage of the upper extension 56 of the piston ro'd 55. Bushing members I4 and I5 are provided within the block I2 toaiford guidance for the 'rod 56. j' .Member fil extends around the rod 56 and its Qassociated cam 51. As shown in Figure 4, the rectangular member 6| has a first end portion 16 which isfastened to the shaft 62 and the oppositeend TI on the rear side of the rod 56 which carries a .pin I8. The pin 18 is adapted to extend into a socket I9 in aninsert member 89 placed in theupwardl extending tilting plate I26. I Thepin I8 engages the socket I9 and pre- 1 vents an upward movement of the entire work head when the piston rod 55 is moved upwardly until such time as the pin is withdrawn from the socket I9. As the piston 54 moves upwardly, certain of the elements move to the right as previously described. Included in this movement isthe in its socket I9. Hence as the piston 54 moves upwardly, the cam'surface 58 causes the polish- -ing wheel spindle 22 to move with the roller 59 and associated structure. The spindle 22 is mounted in a journal bracket 8! 'Which is fas- 'tened to the end plate 68 and thus moves with s'i tion of the device as indicated by the work head 'in Figure 4. I In order for the bearing race carrying members I3 to be moved from one station to the-next, the "polishingwheel must be removed from theconcave bearing surface prior ber -12.

to lifting of the wheel from its position within the confines of the annular bearing race. It should be understood therefore that initial movement of the piston 54 causes the polishing wheel to move to a position centrally of the race "being-polished. This is accomplished, of course, by'thecam surface 58 riding against the roller 59. The pin 18 within thesocket l9 prevents upward movement of the polishing wheel until :such time as the polishing wheel is in a position centrally of the annular race.

Alug 82 is fastened to "the piston rod 55 'and moves with the rod. When the .lug 82 contacts the under surface of the bushing 14, the polishing wheel has moved .out frompolishing contact and is ready to be raised from within-the annular trace. Continued movement, therefore, of the i-pis'ton 54 will cause-upward movement of the heretofore stationary block member 12 with respect to the tilting plate 126. The tilting plate 1261s equipped with recessed sideportions 83 and 84 near the top thereof, thus leaving a central forwardly projecting portion 85. A plate 86 of greater width than the forwardly projecting portion 85 is attached thereto by bolts 81 in such a manner that the side recess portions 83 and 84 are now enclosed grooves. The block member 12 has attached thereto -a pair of inwardly 'fprojecting strip -members 88 which engage the vertical slots or grooves 83 and84, thus forming a tongue and groove within which the work head .may be raised and lowered and-properly guided therein. A guide plate I35 is fastened to the plate 86 and projects forwardl forming a verti"al euide'to prevent lateral displacement of the block 12. The plate [35 is preferably hardened to form a good bearing surface.

In order to facilitate and eliminatefriction on theinitial movement of the work head to the right, it moves on a plurality of balls 89 which are confined and carried by bottom and top .plates 9D :and 91,-.respectively. .Each .of these plates hasa Veshapedltrack on its .lballengaging surface. The .members fllland .91 are fastened .to the front plate .68 by.means of bolts-.92 and .83. The -V-shaped ball tracks 1.3.1 and 138 shown in Figurekeep the balls. 89confined within .the work-head. .Springs 94 are adapted to .be positioned within wells flfiformedin the block mem- The wells .95 areopened .at their right tends, .thus permitting insertion of .the springs.

@Adjustablestop members 9% havethreaded stud v.in :Figure 3. The spindle-22 -.is journaled within -a-bearing member-98 which-is clamped vloy-a split circular ring 99 forming :the .frontwr right side of the -member%8l.. 'Abolt lflfllis-adapted-to draw :theasplitclamptfl'togethenand toihold the hearing 98 in fixed position. The rear or'left portion of the member 8| is provided with outwardly and -.rearwardl-y tapered avalls HM. These rte.-

apered walls "til-i are adapted to be clamped within ..oppositely tapered strip :members 4 02 which are fixedlyrattached to the front plate 58 f the work head. set screws 1.03 threadedly engaging the strips 1&2 extend through the strips and Iconv .tact :the :spindleeholding :member; 8'l-'.to \hold' it ;li n;.'an wertlcakposition desiredr 'valve at its lower end as shownat H.

It has been shown that the work head is capableof moving the polishing wheel, from a position engaging the annular-concave race, laterally and then upwardly to permit rotation of the turntable 'H so that the ball bearing race being polished may be successively treated by each'of the work heads G, H, I, and J. After the polishing wheel 8 of'the first work head G has completed its polishing, the fgrain of the polishing ii iinclined .as shown at I04 in Figures '7 and 8. The fluid cylinder 49 is then actuated as described above, causing thepolishing wheel [8 to initially move .to a position centrally of the bearingrace l5 and'ithen upwardlyso that the polishing wheel is clear of the race. The turntable then rotates so that the race i5 is positioned beneath the work head H, and 'in order to effect downward at the top of :the cylinder, thus forcing the piston 54 downwardly. The work head moves downwardly, and by reason of the inclined camsurface 58 the roller 59 is permitted rearward'movement -or movementt-o the left as viewed in Figure 4.

The springs 94, however, act to maintain the .spindleand its associated'polishing wheel in their foremost position, and hence another means must necessarily overcome the action of the springs 'to cause the spindle to move inwardly into engagementwith the race to be polishedby the polishing wheel.

1 As'best shown in Figure 5, :a conduit N15 is supplied with a source of fluid under pressure (-not shown) and delivers this fluid to a valve I05 which is used to regulate the amount of fluid passage by a hand wheel 10?. Zhe fluid under pressure then passes upwardly through a continuing conduit I08 and feeds the fluid to a control valve N39. The control valve H39 includes a sliding stem H0 having a tapered flange disc A spring H2 is adapted to normally move the valve disc HI upwardly into engagement with a seat H3 formed in the housing of the control valve. When the valve disc H is in a seating position with respect to the seat H3, the fluid in the conduit 38 is barred from passing to the outlet H4 of the control valve 409. This condition prevails when the work head is in an up and non-operating position. The stem "I H] hasa nut 1 l5 .adjustably engaging the upper end thereof. This upward extension of the stem Hi3 projects out of the housing of the control valve H19, and upon applying a downward pressure on the nut H5 sufficiently strong to overcome the action of the spring I E2, the valve disk 5 l I may be moved away from the seat H3, thus permitting fluid under pressure to pass from the inlet H6 of the valve 189 to the outlet H4. Suitable packing H! is provided around the upper extension 0f the valve member vHi3, and a bushing H8 is adapted to hold this packing in position. As the work head moves downwardly, the bottom plate is arranged to strike thenut H5 and. open the control valve 409 so that fluid under pressure is permitted to pass throughthe valve and to a con- 1of2the bearing race to be polished and has not yetcontacted the bearing surface. The conduit H9 passes upwardly and terminates at a discharge opening I20 within achamber I2! formed between the flexible cup 63 and the plug member 69. It will be recalled that the plug member 69Tis stationary in so far as lateral movement is concerned, and thus the fluid under pressure as it enters the chamber I2l will act against the flexible cup 63, forcing the flanges of the cup outwardly against the block member I2 and moving the cup and its associated assemblies laterally so that the roller 59 moves over against the upper extension 56 of the piston rod 55. Simultanee ously, of course, the polishing wheel and its associated spindle move laterally into work-engaging position The chamber I2! is sealed against fluid pressures by a packing I22 surrounding the shaft 62 and a bushing I 23 threadedly engaging the plugiiil firmlyholding the packing in position. The shaft 62 can thus have lateral movement with fluid pressure being confined Within the chamber I2I. As the fluid pressure moves the member 6| laterally, the pin I8 reengages its socket I9 and thus the work head may. not move vertically without first movinglaterally.

The engagement of the polishing wheel with the race to be polished is thus directly controlled by the fluid pressure coming from the conduit I I 9, as shown in Figures 3 and 5, to the chamber I2I. Theregulating valve I06 may be adjusted so that the polishing wheel will contact the surface to be polished with any amount of pressure desired. As shown in Figures 9. and 10, after the race I has been polished with the wheels IB'and IS, the polishing grain is composed of the inclined polishing marks I04 from the wheel I8 and also includes cross-inclined polishing marks I24 from the polishing wheelIQ. Indexing of V the table another time so that the polishing wheel 2| engages the race I5 as shown in Figures 11 and 12 causes a third grain I25 to be recorded on the race. As stated above this third grainis parallel with the surfaces of the bearing race. The multiple positions at which the polishing wheels contact the race I5 reduce the possibility of grinding ridges being left in the race and unpolished. The fourth polishing wheel on the J work head is not shown, but is identical in shape and. position to the polishing wheel 2|. The abrasive qualities of this last wheel, however, are less than the abrasive qualities of the wheel 2| and thus impart a final fine surface to the crossed and parallel polishing grain made by the polishing wheels I8, I9, 20, and 2I.

Numerous details of construction may be varied throughout a wide range without departing from the principles disclosed herein, and I therefore do not propose limiting the patent granted hereon otherwise than as necessitated by the appended claims.

What is claimed is:

l. A machine for polishing internal annular bearing races comprising a support, a vertically slidable member carried on said support, a rotatable spindle, a spindle journalling member slidable laterally in said vertically slidable member, a polishing Wheel attached to said spindle, means positioning a rotatable bearing race adjacent said support, and means for moving said vertically slidable member so the accompanying polishing wheel is positioned centrally of the bearing race, and means for subsequently laterally moving said spindle journalling member so the polishing wheel engages the race to be polished, said means for moving the vertically slidable member including a fluid cylinder carried on the support and a piston for said fluid cylinder connected to said vertically slidable member for movement with said vertically slidable member, said means for subsequently later,- ally movingsaid spindlejournalling member in one direction including a fluid under pressure and cam means onsaid piston for said fluid cylinder adapted to move said spindle journalling member laterally in a direction opposite to the direction of movement by the fluid under pressure and a lug member on said piston for said fluid cylinder adapted to engage said vertically slidable member to effect return movement thereof, whereby the polishing wheel is positioned out of the plane of the bearing race;

, 2. A polishing device including a stationary member, a fluid operated cylinder fixed in a vertical position to said stationary member, a piston adapted to be moved by fluid pressure vertically within said cylinder, a piston rod connected to said piston and movable therewith, a head member constructedand. arrangedto slide vertically with respect to said stationary member, said piston rod journalled for slidable movement through said head member, a spindle, a spindle carrying member arranged and constructed to slide laterally within said head member, a polishing wheel: on said spindle, means on said piston rod. for shifting said spindle carrying member laterally in one direction, and further means fixedto said piston'rod for moving said head member vertically.

.3;-A polishing device including a stationary member, a fluid operated cylinder fixed in a verticalposition to said stationary member, a. piston adapted to be moved by fluid pressure vertically 'Withinnsaid cylinder, a piston rod connected to said piston and movable. therewith, a head mem: ber constructed and arranged to slide vertically with respect to said stationary member, said piston rod journalled for slidable movement through said head member, a spindle, a spindle carrying member arranged and constructed to slide laterally within said head member, a polishing wheel on said spindle, means for shifting said spindle carrying member laterally in one direction, and further means fixed to said piston rod for shifting said head member vertically, said means for shifting said spindle carrying member laterally in one direction comp-rising a cam on said piston rod.

4. A polishing device including a stationary member, a fluid'operated cylinder fixed in a vertical position to said stationary member, a piston adapted to be moved by fluid pressure vertically within said cylinder, a piston rod connected to said piston and movable therewith, a head member constructed and arranged to slide vertically with respect to said stationary member, said piston rod journalled for slidable movement through said head member, a spindle, a spindle carrying member telescoping said head member and arranged and constructed to slide laterally with respect to said head member, a polishing wheel on said spindle, means shifting said spindle carrying member laterally, and further means fixed to said piston rod for shifting said head member vertically comprising a stop member fastened to said piston rod for engaging the underside of said head member.

5. A polishing device including a stationary member, a fluid operated cylinder fixed in a vertical position to said stationary member, a piston adapted to be moved by fluid pressure vertically within said cylinder, a piston'rod connectecflto said piston and movable therewith, a head member constructed and arranged to slide vertically with respect to said stationary'member, said piston rod journalled for slidable movement through said. head member, a spindle, a spindle carrying member telescoping said head member and arranged and constructed to slide laterally with respect to said head member, a polishing wheel on said spindle, means shifting said spindle carrying. member laterally in one direction, and further means fixed to said piston rod for shifting said head member vertically, said means for shifting said spindle carrying member laterally in one direction including said head member having a horizontally disposed cylinder therein, a piston connected to said: spindle carrying member and adapted to slide in said horizontally disposed cylinder, a fluid under pressure, and regulating means for admitting the fluid under pressure to said horizontally disposed cylinder to move the piston and its connected spindle carrying member laterally in the one direction.

6. A polishing device including a stationary member, a fluid operated cylinder fixed in a vertical position to said stationary member, a piston adapted to be moved by fluid pressure vertically within said cylinder, a piston rod connected to said piston and movable therewith, a head member constructed and arranged to slide vertically with respect to said stationary member, said piston rod journalled for slidable movement through said head member, a spindle, a spindle carrying member telescoping said. head member and arranged and constructed to slide laterally with respect to said head member, a polishing wheel on said spindle, means for shifting said spindle carrying member laterally, and further means associated with said piston rod 12 for shifting said head" member vertically, said means for shifting, said spindlecarrying member laterally including said'he'ad member having a horizontally disposed. cylinder therein, a piston connected to said spindle carrying member and adapted to slide in said horizontally disposed cylinder, a fluid under pressure, and regulating means for admitting the fluid under pressure to said horizontally disposed cylinder to move the piston and its connected spindle carrying mem.- ber laterally in one direction and said means for shifting said spindle carrying member lateral-1y further including a cam on said piston rod for moving said spindle carrying member in an opposite direction.

THEODORE R. BRINK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 810,903 Blechschm-idt Jan. 30, 1906 1,229,162 Starin June 5, 1917 1,848,108 Copland Mar. 8, 1932 1,933,028 Raule Oct. 31, 1933 1,933,373 Fraser Oct. 31, 1933 1,934,555 Nelson 1 Nov. 7, 1933 1,964,433 Guild et a1 June 26, 1934 1,997,978 Raule Apr. 16, 1935 2,029,511 Steiner et a1; Feb. 4, 1936 2,206,842 Indge' -1 July 2,. 1940 2,248,172 Hollengreen et al'. July 8, 1941 2,356,499 Beduneau Aug. 22, 1944 2,386,649 Belcourt Oct. 9, 1945 2,398,660 Michel'sen er a1. Apr. 16, 1946 2,418,535 Wild -1 Apr. 8, 1947 

